High-entropy ceramic material for preparing heat-stable NTC (Negative Temperature Coefficient) thermistor and preparation method of high-entropy ceramic material

The invention discloses a high-entropy ceramic material for preparing a heat-stable NTC (Negative Temperature Coefficient) thermistor and a preparation method of the high-entropy ceramic material. The molecular formula of the high-entropy ceramic material is FexCoyNizCuwMn (3-x-y-z-w) O4, wherein 0.4 < = x < = 0.8, 0.4 < = y < = 0.8, 0.4 < = z < = 0.8, and 0.4 < = w < = 0.8; the preparation method comprises the following steps: preparing a metal oxide powder material according to a stoichiometric ratio; the preparation method comprises the following steps: carrying out ball milling and pre-sintering on metal oxide powder to obtain powder with reaction activity; carrying out ball milling and drying on the pre-sintered powder, and molding into a block ingot; compacting the block ingot in a cold isostatic press, and demolding to obtain a biscuit; and the biscuit is placed in a muffle furnace to be subjected to densification sintering according to a preset sintering curve, and the NTC thermistor is subsequently p